<SEC-DOCUMENT>0001104659-21-025455.txt : 20210219
<SEC-HEADER>0001104659-21-025455.hdr.sgml : 20210219
<ACCEPTANCE-DATETIME>20210219060529
ACCESSION NUMBER:		0001104659-21-025455
CONFORMED SUBMISSION TYPE:	8-K
PUBLIC DOCUMENT COUNT:		3
CONFORMED PERIOD OF REPORT:	20210219
ITEM INFORMATION:		Other Events
ITEM INFORMATION:		Financial Statements and Exhibits
FILED AS OF DATE:		20210219
DATE AS OF CHANGE:		20210219

FILER:

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			Synthetic Biologics, Inc.
		CENTRAL INDEX KEY:			0000894158
		STANDARD INDUSTRIAL CLASSIFICATION:	PHARMACEUTICAL PREPARATIONS [2834]
		IRS NUMBER:				133808303
		STATE OF INCORPORATION:			NV
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		8-K
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-12584
		FILM NUMBER:		21651938

	BUSINESS ADDRESS:	
		STREET 1:		9605 MEDICAL CENTER DRIVE
		STREET 2:		SUITE 270
		CITY:			ROCKVILLE
		STATE:			MD
		ZIP:			20850
		BUSINESS PHONE:		(734) 332-7800

	MAIL ADDRESS:	
		STREET 1:		9605 MEDICAL CENTER DRIVE
		STREET 2:		SUITE 270
		CITY:			ROCKVILLE
		STATE:			MD
		ZIP:			20850

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	ADEONA PHARMACEUTICALS, INC.
		DATE OF NAME CHANGE:	20081027

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	PIPEX PHARMACEUTICALS, INC.
		DATE OF NAME CHANGE:	20061214

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	SHEFFIELD PHARMACEUTICALS INC
		DATE OF NAME CHANGE:	19970730
</SEC-HEADER>
<DOCUMENT>
<TYPE>8-K
<SEQUENCE>1
<FILENAME>tm217135d2_8k.htm
<DESCRIPTION>FORM 8-K
<TEXT>
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<!-- Field: Rule-Page --><DIV STYLE="margin-top: 12pt; margin-bottom: 3pt; width: 100%"><DIV STYLE="font-size: 1pt; border-top: Black 2pt solid; border-bottom: Black 1pt solid">&nbsp;</DIV></DIV><!-- Field: /Rule-Page -->

<P STYLE="margin: 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B>UNITED STATES</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B>SECURITIES AND EXCHANGE COMMISSION</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B>WASHINGTON, D.C. 20549</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B>FORM 8-K</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B>CURRENT REPORT</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B>Pursuant to Section 13 or 15(d)</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B>of the Securities Exchange Act of 1934</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B>Date of Report (Date of earliest event
reported):&nbsp;February 19, 2021</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><FONT STYLE="font-size: 14pt"><B>SYNTHETIC
BIOLOGICS, INC.</B></FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center">(Exact name of registrant as specified in
its charter)</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<TABLE CELLSPACING="0" CELLPADDING="0" STYLE="font: 10pt Times New Roman, Times, Serif; width: 100%; border-collapse: collapse">
<TR STYLE="vertical-align: top">
    <TD STYLE="width: 32%; border-bottom: black 1pt solid; padding-right: 0.8pt; text-align: center"><FONT STYLE="font-size: 10pt"><B>Nevada</B></FONT></TD>
    <TD STYLE="width: 2%; padding-right: 0.8pt; text-align: center">&nbsp;</TD>
    <TD STYLE="width: 32%; border-bottom: black 1pt solid; padding-right: 0.8pt; text-align: center"><FONT STYLE="font-size: 10pt"><B>001-12584</B></FONT></TD>
    <TD STYLE="width: 2%; padding-right: 0.8pt; text-align: center">&nbsp;</TD>
    <TD STYLE="width: 32%; border-bottom: black 1pt solid; padding-right: 0.8pt; text-align: center"><FONT STYLE="font-size: 10pt"><B>13-3808303</B></FONT></TD></TR>
<TR STYLE="vertical-align: top">
    <TD>
        <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0.8pt 0pt 0; text-align: center">(State or other jurisdiction of</P>
        <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0.8pt 0pt 0; text-align: center">incorporation)</P></TD>
    <TD STYLE="padding-right: 0.8pt; text-align: center">&nbsp;</TD>
    <TD STYLE="padding-right: 0.8pt; text-align: center"><FONT STYLE="font-size: 10pt">(Commission File No.)</FONT></TD>
    <TD STYLE="padding-right: 0.8pt; text-align: center">&nbsp;</TD>
    <TD>
        <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0.8pt 0pt 0; text-align: center">(IRS Employer Identification</P>
        <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0.8pt 0pt 0; text-align: center">No.)</P></TD></TR>
</TABLE>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; color: white">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B>9605 Medical Center Drive, Suite 270</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B>Rockville, Maryland 20850</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center">(Address of principal executive offices
and zip code)</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B>(301) 417-4364</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center">Registrant&rsquo;s telephone number, including
area code</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B>N/A</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center">(Former name or former address, if changed
since last report)</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify">Check the appropriate box below if the
Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions
(see General Instruction A.2. below):</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0; margin-bottom: 0; width: 100%"><TR STYLE="vertical-align: top; text-align: justify">
<TD STYLE="width: 0.25in"></TD><TD STYLE="width: 0.25in; text-align: left"><FONT STYLE="font-family: Wingdings; font-size: 10pt">&uml;</FONT></TD><TD STYLE="text-align: justify"><FONT STYLE="font-size: 10pt">Written communications
pursuant to Rule 425 under the Securities Act (17 CFR 230.425)</FONT></TD>
</TR></TABLE>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0; margin-bottom: 0; width: 100%">
<TR STYLE="vertical-align: top">
    <TD STYLE="width: 0.25in; padding-right: 0.8pt">&nbsp;</TD>
    <TD STYLE="width: 0.25in; padding-right: 0.8pt"><FONT STYLE="font-family: Wingdings; font-size: 10pt">&uml;</FONT><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="padding-right: 0.8pt; text-align: justify"><FONT STYLE="font-size: 10pt">Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)</FONT></TD></TR>
</TABLE>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0; margin-bottom: 0; width: 100%">
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    <TD STYLE="width: 0.25in; padding-right: 0.8pt">&nbsp;</TD>
    <TD STYLE="width: 0.25in; padding-right: 0.8pt"><FONT STYLE="font-family: Wingdings; font-size: 10pt">&uml;</FONT><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="padding-right: 0.8pt; text-align: justify"><FONT STYLE="font-size: 10pt">Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))</FONT></TD></TR>
</TABLE>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0; margin-bottom: 0; width: 100%">
<TR STYLE="vertical-align: top">
    <TD STYLE="width: 0.25in; padding-right: 0.8pt">&nbsp;</TD>
    <TD STYLE="width: 0.25in; padding-right: 0.8pt"><FONT STYLE="font-family: Wingdings; font-size: 10pt">&uml;</FONT><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="padding-right: 0.8pt; text-align: justify"><FONT STYLE="font-size: 10pt">Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))</FONT></TD></TR>
</TABLE>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify">Securities registered pursuant to Section
12(b) of the Act:</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify">&nbsp;</P>

<TABLE CELLSPACING="0" CELLPADDING="0" STYLE="font: 10pt Times New Roman, Times, Serif; width: 100%; border-collapse: collapse">
<TR STYLE="vertical-align: top">
    <TD STYLE="border: black 1pt solid; vertical-align: bottom; padding: 0; width: 33%; text-align: center; text-indent: 0"><FONT STYLE="font-size: 10pt"><B>Title of each class</B></FONT></TD>
    <TD STYLE="border-top: black 1pt solid; vertical-align: bottom; padding: 0; width: 34%; border-right: black 1pt solid; border-bottom: black 1pt solid; text-align: center; text-indent: 0"><FONT STYLE="font-size: 10pt"><B>Trading Symbol(s)</B></FONT></TD>
    <TD STYLE="border-top: black 1pt solid; vertical-align: bottom; padding: 0; width: 33%; border-right: black 1pt solid; border-bottom: black 1pt solid; text-align: center; text-indent: 0"><FONT STYLE="font-size: 10pt"><B>Name of each exchange on which<BR>
registered</B></FONT></TD></TR>
<TR STYLE="vertical-align: top">
    <TD STYLE="padding: 0; border-right: black 1pt solid; border-bottom: black 1pt solid; border-left: black 1pt solid; text-align: center; text-indent: 0"><FONT STYLE="font-size: 10pt">Common stock, par value $0.001 per share</FONT></TD>
    <TD STYLE="padding: 0; border-bottom: black 1pt solid; border-right: black 1pt solid; text-align: center; text-indent: 0"><FONT STYLE="font-size: 10pt">SYN</FONT></TD>
    <TD STYLE="padding: 0; border-bottom: black 1pt solid; border-right: black 1pt solid; text-align: center; text-indent: 0"><FONT STYLE="font-size: 10pt">NYSE American</FONT></TD></TR>
</TABLE>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify">Indicate by check mark whether the registrant
is an emerging growth company as defined in in Rule 405 of the Securities Act of 1933 (17 CFR &sect;230.405 of this chapter) or
Rule 12b-2 of the Securities Exchange Act of 1934 (17 CFR &sect;240.12b-2 of this chapter).</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: right">Emerging growth company&nbsp;<FONT STYLE="font-family: Wingdings">&uml;</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify">If an emerging growth company, indicate
by checkmark if the registrant has elected not to use the extended transition period for complying with any new or revised financial
accounting standards provided pursuant to Section 13(a) of the Exchange Act.&nbsp;<FONT STYLE="font-family: Wingdings">&uml;</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"></P>

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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"></P>

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    <!-- Field: /Page -->

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0; margin-bottom: 0; width: 100%"><TR STYLE="vertical-align: top; text-align: justify">
<TD STYLE="width: 0in"></TD><TD STYLE="width: 1in; text-align: left"><FONT STYLE="font-size: 10pt"><B>Item 8.01.</B></FONT></TD><TD STYLE="text-align: justify"><FONT STYLE="font-size: 10pt"><B>Other Events.</B></FONT></TD>
</TR></TABLE>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify">On February 19, 2021, Synthetic Biologics,
Inc. (the &ldquo;Company&rdquo;) filed a prospectus supplement to its Registration Statement on Form S-3 (File No. 333-224728),
which was declared effective on May 15, 2018 (the &ldquo;Registration Statement&rdquo;), to update and amend certain information
contained in the prospectus, dated May 15, 2018, relating to the offer and sale of shares of the Company&rsquo;s common stock from
time to time through or directly to&nbsp;B. Riley Securities, Inc. (&ldquo;B. Riley&rdquo;) and A.G.P./Alliance Global Partners
(&ldquo;AGP&rdquo;), each acting as sales agent or principal. Any such sales would be deemed to be an &ldquo;at the market offering&rdquo;
as defined in Rule 415(a)(4) promulgated under the Securities Act of 1933, as amended, pursuant to the Amended and Restated At
Market Issuance Sales Agreement, dated February 9, 2021, by and among the Company, B. Riley and AGP (the &ldquo;Sales Agreement&rdquo;).&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify">As of February 18, 2021, the Company has
sold an aggregate of 65,685,544 shares of common stock (on a post 2018 split basis) having an aggregate offering price of $63,601,894
under the Sales Agreement pursuant to the Registration Statement. As of February 18, 2021, the Company had 105,223,086 shares of
common stock outstanding, after taking into account shares of common stock issued pursuant to warrant exercises, shares of common
stock issued upon conversion of preferred stock and sales in the Company&rsquo;s &ldquo;at the market offering.&rdquo;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify">The opinion of the Company&rsquo;s counsel
regarding the validity of the shares of common stock that will be issued pursuant to the Sales Agreement and the prospectus supplement
is filed herewith as Exhibit&nbsp;5.1 and is incorporated by refence herein.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify">This Current Report on Form 8-K shall not
constitute an offer to sell or the solicitation of an offer to buy any security nor shall there be any sale of these securities
in any state in which such offer, solicitation or sale would be unlawful prior to registration or qualification under the securities
laws of any such state.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><B>&nbsp;</B></P>

<TABLE CELLPADDING="0" CELLSPACING="0" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0; margin-bottom: 0; width: 100%"><TR STYLE="vertical-align: top; text-align: justify">
<TD STYLE="width: 0in"></TD><TD STYLE="width: 1in; text-align: left"><B>Item 9.01.</B></TD><TD STYLE="text-align: justify"><B>Financial Statements and Exhibits.</B></TD>
</TR></TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.45in">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0; margin-bottom: 0; width: 100%"><TR STYLE="vertical-align: top; text-align: justify">
<TD STYLE="width: 0in"></TD><TD STYLE="width: 0.25in; text-align: left"><FONT STYLE="font-size: 10pt">(d)</FONT></TD><TD STYLE="text-align: justify"><FONT STYLE="font-size: 10pt">Exhibits.</FONT></TD>
</TR></TABLE>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify; text-indent: 0.45in">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify; text-indent: 0.45in">The following exhibits
are filed with this Current Report on Form 8-K.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.45in">&nbsp;</P>

<TABLE CELLSPACING="0" CELLPADDING="0" STYLE="font: 10pt Times New Roman, Times, Serif; width: 100%; border-collapse: collapse">
<TR>
    <TD STYLE="vertical-align: bottom; width: 10%; border-bottom: black 1pt solid; padding-right: 0.8pt; text-align: center"><FONT STYLE="font-size: 10pt"><B>Exhibit<BR>
Number</B></FONT></TD>
    <TD STYLE="vertical-align: top; width: 2%; padding-right: 0.8pt">&nbsp;</TD>
    <TD STYLE="vertical-align: bottom; width: 88%; border-bottom: black 1pt solid; padding-right: 0.8pt"><FONT STYLE="font-size: 10pt"><B>Description</B></FONT></TD></TR>
<TR STYLE="vertical-align: top">
    <TD STYLE="padding-right: 0.8pt; text-align: center">&nbsp;</TD>
    <TD STYLE="padding-right: 0.8pt">&nbsp;</TD>
    <TD STYLE="padding-right: 0.8pt">&nbsp;</TD></TR>
<TR>
    <TD STYLE="vertical-align: top; padding-right: 0.8pt; text-align: center"><A HREF="tm217135d2_ex5-1.htm" STYLE="-sec-extract: exhibit"><FONT STYLE="font-size: 10pt">5.1</FONT></A></TD>
    <TD STYLE="vertical-align: bottom; padding-right: 0.8pt">&nbsp;</TD>
    <TD STYLE="vertical-align: top; padding-right: 0.8pt"><A HREF="tm217135d2_ex5-1.htm" STYLE="-sec-extract: exhibit"><FONT STYLE="font-size: 10pt">Opinion of Parsons Behle &amp; Latimer</FONT></A></TD></TR>
<TR>
    <TD STYLE="vertical-align: top; padding-right: 0.8pt; text-align: center">&nbsp;</TD>
    <TD STYLE="vertical-align: bottom; padding-right: 0.8pt">&nbsp;</TD>
    <TD STYLE="vertical-align: top; padding-right: 0.8pt">&nbsp;</TD></TR>
<TR>
    <TD STYLE="vertical-align: top; padding-right: 0.8pt; text-align: center"><A HREF="tm217135d2_ex5-1.htm" STYLE="-sec-extract: exhibit"><FONT STYLE="font-size: 10pt">23.1</FONT></A></TD>
    <TD STYLE="vertical-align: bottom; padding-right: 0.8pt">&nbsp;</TD>
    <TD STYLE="vertical-align: top; padding-right: 0.8pt"><A HREF="tm217135d2_ex5-1.htm" STYLE="-sec-extract: exhibit"><FONT STYLE="font-size: 10pt">Consent of Parsons Behle &amp; Latimer (included in Exhibit 5.1 hereof)</FONT></A></TD></TR>
</TABLE>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>


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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B>SIGNATURES</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify">Pursuant to the requirements of the Securities
Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<TABLE CELLSPACING="0" CELLPADDING="0" STYLE="font: 10pt Times New Roman, Times, Serif; width: 100%; border-collapse: collapse">
<TR STYLE="vertical-align: top">
    <TD STYLE="padding-right: 0.8pt"><FONT STYLE="font-size: 10pt">Dated: February 19, 2021</FONT></TD>
    <TD COLSPAN="3" STYLE="padding-right: 2.8pt"><FONT STYLE="font-size: 10pt">SYNTHETIC BIOLOGICS, INC.</FONT></TD></TR>
<TR STYLE="vertical-align: top">
    <TD STYLE="width: 50%; padding-right: 0.8pt">&nbsp;</TD>
    <TD STYLE="width: 5%; padding-right: 0.8pt">&nbsp;</TD>
    <TD STYLE="width: 5%; padding-right: 0.8pt">&nbsp;</TD>
    <TD STYLE="width: 40%; padding-right: 0.8pt">&nbsp;</TD></TR>
<TR STYLE="vertical-align: top">
    <TD STYLE="padding-right: 0.8pt">&nbsp;</TD>
    <TD STYLE="padding-right: 0.8pt"><FONT STYLE="font-size: 10pt">By:</FONT></TD>
    <TD COLSPAN="2" STYLE="border-bottom: black 1pt solid; padding-right: 1.8pt"><FONT STYLE="font-size: 10pt">/s/ Steven A. Shallcross</FONT></TD></TR>
<TR STYLE="vertical-align: top">
    <TD STYLE="padding-right: 0.8pt">&nbsp;</TD>
    <TD STYLE="padding-right: 0.8pt">&nbsp;</TD>
    <TD STYLE="padding-right: 0.8pt"><FONT STYLE="font-size: 10pt">Name:</FONT></TD>
    <TD STYLE="padding-right: 0.8pt"><FONT STYLE="font-size: 10pt">Steven A. Shallcross</FONT></TD></TR>
<TR STYLE="vertical-align: top">
    <TD STYLE="padding-right: 0.8pt">&nbsp;</TD>
    <TD STYLE="padding-right: 0.8pt">&nbsp;</TD>
    <TD STYLE="padding-right: 0.8pt"><FONT STYLE="font-size: 10pt">Title:</FONT></TD>
    <TD STYLE="padding-right: 1.5pt"><FONT STYLE="font-size: 10pt">Chief Executive Officer and Chief Financial Officer</FONT></TD></TR>
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<DOCUMENT>
<TYPE>EX-5.1
<SEQUENCE>2
<FILENAME>tm217135d2_ex5-1.htm
<DESCRIPTION>EXHIBIT 5.1
<TEXT>
<HTML>
<HEAD>
     <TITLE></TITLE>
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<BODY STYLE="font: 10pt Times New Roman, Times, Serif">

<P STYLE="text-align: right; margin: 0"><B>&nbsp;</B></P>

<P STYLE="margin: 0; text-align: right"><B><U>Exhibit 5.1</U></B></P>

<P STYLE="margin: 0; text-align: right"><B>&nbsp;</B></P>

<P STYLE="margin: 0"></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><IMG SRC="image_001.jpg" ALT="" STYLE="height: 82px; width: 82px">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">February 19, 2021</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">The Board of Directors</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">Synthetic Biologics, Inc.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">9605 Medical Center Drive, Suite 270</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">Rockville, Maryland 20850</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<TABLE CELLSPACING="0" CELLPADDING="0" STYLE="font: 10pt Times New Roman, Times, Serif; width: 100%; border-collapse: collapse">
<TR STYLE="vertical-align: top">
    <TD STYLE="width: 2%; padding-right: 0.8pt">&nbsp;</TD>
    <TD STYLE="width: 5%; padding-right: 0.8pt"><FONT STYLE="font-size: 10pt"><B>Re:</B></FONT></TD>
    <TD STYLE="width: 93%; padding-right: 0.8pt"><FONT STYLE="font-size: 10pt"><B>Synthetic Biologics, Inc.</B></FONT></TD></TR>
</TABLE>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 48.6pt">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">Ladies and Gentlemen:</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify; text-indent: 0.45in">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify; text-indent: 0.45in">We have acted as special
Nevada counsel to Synthetic Biologics, Inc., a Nevada corporation (the &ldquo;<U>Company</U>&rdquo;), in connection with the proposed
issuance of up to $50,000,000 of shares (the &ldquo;<U>Shares</U>&rdquo;) of common stock of the Company, par value $0.001 per
share (the &ldquo;<U>Common Stock</U>&rdquo;). The Shares are included in a Registration Statement on Form S-3 (File No. 333-224728)
(the &ldquo;<U>Registration Statement</U>&rdquo;) filed with the Securities and Exchange Commission (the &ldquo;<U>Commission</U>&rdquo;)
under the Securities Act of 1933, as amended (the &ldquo;<U>Securities Act</U>&rdquo;), and declared effective by the Commission
on May 15, 2018, a base prospectus, dated May 15, 2018, included in the Registration Statement at the time it originally became
effective (the &ldquo;<U>Base Prospectus</U>&rdquo;), and a prospectus supplement, dated February 19, 2021, filed on the date hereof
with the Commission pursuant to Rule 424(b) under the Securities Act (together with the Base Prospectus, the &ldquo;<U>Prospectus</U>&rdquo;).
The Shares are being sold pursuant to an Amended and Restated At Market Issuance Sales Agreement, dated February 9, 2021, by and
among the Company, B. Riley Securities, Inc. and A.G.P./Alliance Global Partners (the &ldquo;<U>Sales Agreement</U>&rdquo;).</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify; text-indent: 0.45in">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify; text-indent: 0.45in">This opinion letter
is being delivered in accordance with the requirements of Item 601(b)(5) of Regulation S-K under the Securities Act.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify; text-indent: 0.45in">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify; text-indent: 0.45in">As counsel to the
Company, we have examined such matters of fact and questions of law as we have considered appropriate for purposes of this letter.
With your consent, we have relied upon certificates and other assurances of officers of the Company and others as to factual matters
without having independently verified such factual matters. We are opining herein as to the Nevada Revised Statutes (the &ldquo;<U>NRS</U>&rdquo;),
and we express no opinion with respect to the applicability thereto, or the effect thereon, of the laws of any other jurisdiction
or, in the case of Nevada, any other laws, or as to any matters of municipal law or the laws of any local agencies within any state.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify; text-indent: 0.45in">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify; text-indent: 0.45in">We have made such
examination as we have deemed necessary for the purpose of this opinion.&nbsp;&nbsp;Based upon such examination, it is our opinion,
that, when the Shares shall have been duly registered on the books of the transfer agent and registrar therefor in the name or
on behalf of the purchasers, and have been issued by the Company against payment therefor (not less than par value) in the circumstances
contemplated by the Sales Agreement, the issuance and sale of the Shares will have been duly authorized by all necessary corporate
action of the Company, and the Shares will be validly issued, fully paid and nonassessable.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify; text-indent: 0.45in">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify; text-indent: 0.45in">In rendering the foregoing
opinion, we have assumed that (i) the Company will comply with all applicable notice requirements regarding uncertificated shares
provided in the NRS and (ii) upon the issuance of any of the Shares, the total number of shares of Common Stock issued and outstanding
will not exceed the total number of shares of Common Stock that the Company is then authorized to issue under its articles of incorporation,
as amended and restated as of the date hereof.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify; text-indent: 0.45in">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify; text-indent: 0.45in">This opinion is given
as of the date hereof and we assume no obligation to advise you of changes that may hereafter be brought to our attention. This
opinion is delivered solely in connection with the consummation of the transactions described herein, and may not be relied upon
by you for any other purpose nor by any other person for any purpose.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify; text-indent: 0.45in">&nbsp;</P>


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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify; text-indent: 0.45in">We hereby consent
to the reference to our firm under the caption &ldquo;Legal Matters&rdquo; in the Prospectus and to the filing of this opinion
as Exhibit 5.1 to the Company&rsquo;s Current Report on Form 8-K relating to the issuance and sale of the Shares pursuant to the
Sales Agreement. &nbsp;In giving our consent, we do not thereby admit that we are in the category of persons whose consent is required
under Section 7 of the Securities Act or the rules and regulations of the Commission thereunder. &nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<TABLE CELLSPACING="0" CELLPADDING="0" STYLE="font: 10pt Times New Roman, Times, Serif; width: 100%; border-collapse: collapse">
<TR STYLE="vertical-align: top">
    <TD STYLE="width: 50%; padding-right: 0.8pt">&nbsp;</TD>
    <TD STYLE="width: 50%; padding-right: 0.8pt"><FONT STYLE="font-size: 10pt">Very truly yours,</FONT></TD></TR>
<TR STYLE="vertical-align: top">
    <TD STYLE="padding-right: 0.8pt">&nbsp;</TD>
    <TD STYLE="padding-right: 0.8pt">&nbsp;</TD></TR>
<TR STYLE="vertical-align: top">
    <TD STYLE="padding-right: 0.8pt">&nbsp;</TD>
    <TD STYLE="border-bottom: black 1pt solid; padding-right: 0.8pt"><FONT STYLE="font-size: 10pt"><I>/s/ Parsons Behle &amp; Latimer</I></FONT></TD></TR>
<TR STYLE="vertical-align: top">
    <TD STYLE="padding-right: 0.8pt">&nbsp;</TD>
    <TD STYLE="padding-right: 0.8pt"><FONT STYLE="font-size: 10pt">PARSONS BEHLE &amp; LATIMER</FONT></TD></TR>
</TABLE>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify">&nbsp;</P>

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